 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.internal.activities;

 import java.util.ArrayList ;
 import java.util.HashSet ;
 import java.util.Iterator ;
 import java.util.List ;
 import java.util.Set ;

 import org.eclipse.ui.activities.ActivityEvent;
 import org.eclipse.ui.activities.IActivity;
 import org.eclipse.ui.activities.IActivityListener;
 import org.eclipse.ui.activities.IActivityPatternBinding;
 import org.eclipse.ui.activities.IActivityRequirementBinding;
 import org.eclipse.ui.activities.NotDefinedException;
 import org.eclipse.ui.internal.util.Util;

 final class Activity implements IActivity {
     private final static int HASH_FACTOR = 89;

     private final static int HASH_INITIAL = Activity.class.getName().hashCode();

     private final static Set strongReferences = new HashSet ();

     private Set activityRequirementBindings;

     private transient IActivityRequirementBinding[] activityRequirementBindingsAsArray;

     private List activityListeners;

     private Set activityPatternBindings;

     private transient IActivityPatternBinding[] activityPatternBindingsAsArray;

     private boolean defined;

     private boolean enabled;

     private transient int hashCode = HASH_INITIAL;

     private String id;

     private String name;

     private transient String string;

     private String description;
     
     private boolean defaultEnabled;

     Activity(String id) {
         if (id == null) {
             throw new NullPointerException ();
         }

         this.id = id;
     }

     public void addActivityListener(IActivityListener activityListener) {
         if (activityListener == null) {
             throw new NullPointerException ();
         }

         if (activityListeners == null) {
             activityListeners = new ArrayList ();
         }

         if (!activityListeners.contains(activityListener)) {
             activityListeners.add(activityListener);
         }

         strongReferences.add(this);
     }

     public int compareTo(Object object) {
         Activity castedObject = (Activity) object;

         int compareTo = Util.compare(
                 activityRequirementBindingsAsArray,
                 castedObject.activityRequirementBindingsAsArray);

         if (compareTo == 0) {
             compareTo = Util.compare(
                     activityPatternBindingsAsArray,
                     castedObject.activityPatternBindingsAsArray);

             if (compareTo == 0) {
                 compareTo = Util.compare(defined, castedObject.defined);

                 if (compareTo == 0) {
                     compareTo = Util.compare(enabled, castedObject.enabled);

                     if (compareTo == 0) {
                         compareTo = Util.compare(id, castedObject.id);

                         if (compareTo == 0) {
                             compareTo = Util.compare(name, castedObject.name);
                         }
                     }
                 }
             }
         }

         return compareTo;
     }

     public boolean equals(Object object) {
         if (!(object instanceof Activity)) {
             return false;
         }

         final Activity castedObject = (Activity) object;

         if (!Util.equals(activityRequirementBindings,
                 castedObject.activityRequirementBindings)) {
             return false;
         }

         if (!Util.equals(activityPatternBindings,
                 castedObject.activityPatternBindings)) {
             return false;
         }

         if (!Util.equals(defined, castedObject.defined)) {
             return false;
         }

         if (!Util.equals(enabled, castedObject.enabled)) {
             return false;
         }

         if (!Util.equals(id, castedObject.id)) {
             return false;
         }

         return Util.equals(name, castedObject.name);
     }

     void fireActivityChanged(ActivityEvent activityEvent) {
         if (activityEvent == null) {
             throw new NullPointerException ();
         }

         if (activityListeners != null) {
             for (int i = 0; i < activityListeners.size(); i++) {
                 ((IActivityListener) activityListeners.get(i))
                         .activityChanged(activityEvent);
             }
         }
     }

     public Set getActivityRequirementBindings() {
         return activityRequirementBindings;
     }

     public Set getActivityPatternBindings() {
         return activityPatternBindings;
     }

     public String getId() {
         return id;
     }

     public String getName() throws NotDefinedException {
         if (!defined) {
             throw new NotDefinedException();
         }

         return name;
     }

     public int hashCode() {
         if (hashCode == HASH_INITIAL) {
             hashCode = hashCode * HASH_FACTOR
                     + Util.hashCode(activityRequirementBindings);
             hashCode = hashCode * HASH_FACTOR
                     + Util.hashCode(activityPatternBindings);
             hashCode = hashCode * HASH_FACTOR + Util.hashCode(defined);
             hashCode = hashCode * HASH_FACTOR + Util.hashCode(enabled);
             hashCode = hashCode * HASH_FACTOR + Util.hashCode(id);
             hashCode = hashCode * HASH_FACTOR + Util.hashCode(name);
             if (hashCode == HASH_INITIAL) {
                 hashCode++;
             }
         }

         return hashCode;
     }

     public boolean isDefined() {
         return defined;
     }

     public boolean isEnabled() {
         return enabled;
     }

     public boolean isMatch(String string) {
         if (isDefined()) {
             for (Iterator iterator = activityPatternBindings.iterator(); iterator
                     .hasNext();) {
                 ActivityPatternBinding activityPatternBinding = (ActivityPatternBinding) iterator
                         .next();

                 if (activityPatternBinding.isMatch(string)) {
                     return true;
                 }
             }
         }

         return false;
     }

     public void removeActivityListener(IActivityListener activityListener) {
         if (activityListener == null) {
             throw new NullPointerException ();
         }

         if (activityListeners != null) {
             activityListeners.remove(activityListener);
         }

         if (activityListeners.isEmpty()) {
             strongReferences.remove(this);
         }
     }

     boolean setActivityRequirementBindings(Set activityRequirementBindings) {
         activityRequirementBindings = Util.safeCopy(
                 activityRequirementBindings, IActivityRequirementBinding.class);

         if (!Util.equals(activityRequirementBindings,
                 this.activityRequirementBindings)) {
             this.activityRequirementBindings = activityRequirementBindings;
             this.activityRequirementBindingsAsArray = (IActivityRequirementBinding[]) this.activityRequirementBindings
                     .toArray(new IActivityRequirementBinding[this.activityRequirementBindings
                             .size()]);
             hashCode = HASH_INITIAL;
             string = null;
             return true;
         }

         return false;
     }

     boolean setActivityPatternBindings(Set activityPatternBindings) {
         activityPatternBindings = Util.safeCopy(activityPatternBindings,
                 IActivityPatternBinding.class);

         if (!Util.equals(activityPatternBindings, this.activityPatternBindings)) {
             this.activityPatternBindings = activityPatternBindings;
             this.activityPatternBindingsAsArray = (IActivityPatternBinding[]) this.activityPatternBindings
                     .toArray(new IActivityPatternBinding[this.activityPatternBindings
                             .size()]);
             hashCode = HASH_INITIAL;
             string = null;
             return true;
         }

         return false;
     }

     boolean setDefined(boolean defined) {
         if (defined != this.defined) {
             this.defined = defined;
             hashCode = HASH_INITIAL;
             string = null;
             return true;
         }

         return false;
     }

     boolean setEnabled(boolean enabled) {
         if (enabled != this.enabled) {
             this.enabled = enabled;
             hashCode = HASH_INITIAL;
             string = null;
             return true;
         }

         return false;
     }

     boolean setName(String name) {
         if (!Util.equals(name, this.name)) {
             this.name = name;
             hashCode = HASH_INITIAL;
             string = null;
             return true;
         }

         return false;
     }

     boolean setDescription(String description) {
         if (!Util.equals(description, this.description)) {
             this.description = description;
             hashCode = HASH_INITIAL;
             string = null;
             return true;
         }

         return false;
     }

     public String toString() {
         if (string == null) {
             final StringBuffer stringBuffer = new StringBuffer ();
             stringBuffer.append('[');
             stringBuffer.append(activityRequirementBindings);
             stringBuffer.append(',');
             stringBuffer.append(activityPatternBindings);
             stringBuffer.append(',');
             stringBuffer.append(defined);
             stringBuffer.append(',');
             stringBuffer.append(enabled);
             stringBuffer.append(',');
             stringBuffer.append(id);
             stringBuffer.append(',');
             stringBuffer.append(name);
             stringBuffer.append(']');
             string = stringBuffer.toString();
         }

         return string;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.activities.IActivity#getDescription()
      */
     public String getDescription() throws NotDefinedException {
         if (!defined) {
             throw new NotDefinedException();
         }

         return description;
     }
     
     /* (non-Javadoc)
      * @see org.eclipse.ui.activities.IActivity#isDefaultEnabled()
      */
     public boolean isDefaultEnabled() {
         return defaultEnabled;
     }
     
     boolean setDefaultEnabled(boolean defaultEnabled) {
         if (!Util.equals(defaultEnabled, this.defaultEnabled)) {
             this.defaultEnabled = defaultEnabled;
             hashCode = HASH_INITIAL;
             string = null;
             return true;
         }

         return false;
     }
 }

